CdS nanoparticles/ZnO nanorods core-shell heterogeneous thin films were successfully fabricated using a chemical bath deposition process. X-ray diffraction (XRD), optical spectroscopy and field emission scanning electron microscopy (FE-SEM) were used for the characterization of the samples. Photoluminescence (PL) properties of the CdS nanoparticles/ZnO nanorods core-shell heterogeneous films were studied using PL spectroscopy. The injection of electrons from the CdS conduction band into the ZnO conduction band upon excitation was confirmed by PL quenching. The PL quenching in the present study demonstrated that more than one CdS nanoparticle is capable of networking with the single ZnO nanorod and taking an active part in the charge injection process. By attaching the CdS nanoparticles, the authors found the surface photovoltaic characteristics of ZnO were changed significantly. With a liquid electrolyte as the hole transport medium, CdS nanoparticles/ZnO nanorods core-shell heterogeneous film exhibited a short-circuit current density of 3.62 mA cm-2 and an open-circuit voltage of 643 mV with a total light-to-electricity power conversion efficiency of 1.48% under visible light.
Bibliographical noteFunding Information:
This work was supported by a Human Resources Development of the Korea Institute of Energy Technology Evaluation and Planning (KETEP) grant funded by the Korea government Ministry of Knowledge Economy (No.: 20124010203180 ). The author SAV is grateful to DST-SERB, New Delhi (India) for their financial support (SR/FTP/PS-083/2012).
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- CdS nanoparticle
- Core-shell heterogeneous film
- Photovoltaic characterization
- ZnO nanorods